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1 (The nose and mouth make up the first part where air enters your body. 2  The trachea, or windpipe, is the second part and it delivers air to the lungs. 3  Your lungs are the third part where oxygen is absorbed by the blood, which brings it to the rest of the body. 4  Finally, the diaphragm is the fourth part.
The movement of air into and out of the lungs is called breathing! As the diaphragm moves down, it causes the rib cage to move out. This causes a vacuum (suction) to form, drawing air into the body. When the diaphragm moves up, the rib cage moves in, which pushes air out. III.